Following actions need to be tackled in order to address the expected outcomes successfully:

• Clarification of the Occurrence Class of the impurities in the EU market, to enable the RA approach for hydrogen quality assurance. The number of samples acting as a base to define the Occurrence Class is described in action number 3, stated below. Next to the hydrogen quality samples, all required HRS specifics to allow the utilisation of this information as an input for the Occurrence Class of the HRS quality RA should be collected. These will be defined based on input obtained from at least 5 relevant stakeholders such as gas & technology suppliers and HRS operators;
• Validate the capability of at least 5 EU based hydrogen purity laboratories, for both sampling as well as analysing hydrogen according to the applicable standards. Validity of the utilised techniques should be evidenced by mass market investigation of the EU hydrogen quality as stipulated in action number 3, stated below. Next, proficiency testing up to standard level should be regularly conducted and has to be an integral part of the activity. The proficiency results should be made publicly available in an anonymised way. Root cause analysis should be conducted in case of diverging test results and countermeasures should be developed. Utilisation of technologies and methodologies researched in past funded projects is expected and support from the EU metrological network is recommended;
• As a prerequisite to support activity 1 & 2, and to make the information available for future learnings, a publicly accessible hydrogen quality database representing the hydrogen quality supplied in the EU should be established. In order to get a representative and statistical overview of the hydrogen quality dispensed at 350 & 700 bar stations in the EU market, at least 100 samples from the HRSs should be collected and analysed per year, of which maximum 25% of the samples are obtained from the same HRS. The utilised methodologies’ interoperability should be maximised to be applicable on different pressures.  The location of samples taken will be in proportion to the geographically spread of HRSs across the EU.
• Based on the output of objectives 1, 2 and 3, a working group should clarify the development need or improvement opportunities in the field of hydrogen quality assurance. In addition, recommendations to support the development of the future HRS sampling standard should be made.